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We present chemical kinetics measurements of the luminol oxydationchemiluminescence reaction at the interface between two aqueous solutions,using liquid jet technology. Free-flowing iquid microjets are a relativelyrecent development that has found its way into a growing number of applicationsin spectroscopy and dynamics. A variant thereof, called flat-jet, is obtainedwhen two cylindrical jets of a liquid are crossed, leading to a chain of planarleaf-shaped structures of the flowing liquid. We here show that in the firstleaf of this chain the fluids do not exhibit turbulent mixing, providing aclean interface between the liquids from the impinging jets. We also show,using the example of the luminol chemiluminescence reaction, how this setup canbe used to obtain kinetics information from friction-less flow and bycircumventing the requirement for rapid mixing but by intentionally suppressingall turbulent mixing and instead relying on diffusion.

Imaging of chemical kinetics at the water-water interface in a free-flowing liquid flat-jet